Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1d1ab2c7340d6a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 07:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 319e1036724ca58af63d7cb759f7384a SHA-1: 5671491df02fb5d1093ab0b771ecce215d77635f SHA-256: 6e1d1ab2c7340d6abee1ef0c7f63c8e93947814ab522fc73d9c5d7b426c023e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external links, including one pointing to a compromised WordPress upload directory, suggests an attempt to host or distribute further malicious content. The overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132986631675---84918051652.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/gujofomupirimaresobew.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/16267095874.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ksh47lhe9spemd8inthk8dj47c/45463334572.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/berawudamexase.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e4cef58---78884573442.pdfIn PDF document text
    • http://orthopediedelft.eu/files/31678138909.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wadowudoladuxaxiwijuwonu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48849537358.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/52346239330.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/buvovave.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/rezuji.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/brdu36nkool6rbsnkim9nnsrg7/gusuregefopo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/94029617544.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/nanabodixisiwoxaki.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/tamerolob.pdfIn PDF document text
    • https://ags-car.com/upload/files/sitojirawo.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/rolod.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/54944769124.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f33c23b5---fenabizebesonefosis.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/gajatafulipogemitug.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/lepiruverasegulepuxe.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/gitepojew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=appmia+app+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 17084 bytes
SHA-256: 113f8820979e9b211b6946e694488e8328f1a8ec22752d5f99474d5ceb06beac
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 10460 bytes
SHA-256: 02098942470255d0bef04ea4f4555778c53a46e7307c9284066cac848b9f79f5
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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